Convert binary data to blob

A File object in JavaScript references an actual file in the local filesystem. This File object inherits all properties and methods from the Blob class. Although the File objects and Blob objects are different, they expose same methods and properties.

Blobs are very useful while working with binary remote files. A blob can be very large i. They can be created dynamically and using blob URLs they can be used as files. You can use them in many different ways to make them more useful. How to delete a blob manually. I have created a blob that holds a large chunk of data, i want to delete it once my work is done. Hi can we use the bolb with angular and if my server calls are post and not get method to download the documents which are in excel format.

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The array can be of any javascript objects. Jun 28, Narayan Prusty. Leave a Reply Cancel reply. This example uses plain text, but you can imagine the data being a binary file instead. This is building a byte array of 8-bit integers and sending it; you can use any binary data you'd like, of course. Please, read this paragraph. Line 4 sets the Content-Length header to , indicating that the data is bytes long.

Obviously you need to change this value based on the actual size of the data being sent. You can also send binary content by passing an instance of the nsIFileInputStream to send. In that case, you don't have to set the Content-Length header yourself, as the information is fetched from the stream automatically:. Get the latest and greatest from MDN delivered straight to your inbox.

Please check your inbox or your spam filter for an email from us. Receiving binary data using JavaScript typed arrays The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server. Add information about other browsers' support here. The standard send Blob data method can be used instead as explained above. Document Tags and Contributors Tags: Contributors to this page: Learn the best of web development Get the latest and greatest from MDN delivered straight to your inbox.